Core drill



May 19, 1931. Y J. 5. MITCHELL CORE DRILL Filed Nov. 5, 1923 P itslength Patented May 19, 1931 warren smras PATEN'E ore-ice Joanna s.moment, or cnrcaeo, rumors, essreuon ro seamen trauma? comm, aconromrron or messacnusnms conn nnrnn Application filed November 5,1928. Serial No. 672,794.

My invention relates to core drills.

It has for its object 'to provide an improved core'barrel, and, moreparticularly, an improved core barrel especially adapted to use Lg withmud fluid in oil or gas well drilling and having ample space for thefluid whereby sticking of the bit and corebarrel is avoided.

In the accompanying drawings I have shown for purposes of illustrationone form 19 which my invention may assume in practice.

In-these drawings,--

Fig. 1 is a vertical longitudinal sectional view of the bit carryingportion of my improved barrel.

Fig. 2 is a transverse section on line 22 of Fig. 1.

Fig. 3 is a side elevational view of the complete core barrel.

Fig. 4: is a transverse sectional view taken il roggh the barrel memberon line 4-4 of n this illustrative construction I have shown a barrel ofthe general type described and claimed in m co ending application asSer. No. 579,038, ed ug. 1, 1922, and including a bit 1 and a barrelmember 2', both herein being of improved construction and the lattercarrying therein a core lifter 3.

In my improved construction the bit 1 is so of cruciform cross sectionand provided with wings 4 spaced apart by external vertical fluipassages5 of even greater area than those described in my abovementioned application. This bit is herein also provided with verticalfluid passages 6 of suitable area in the form of grooves in the perihery of the core passa e 7. Moreover, it will be noted that the bitcarries on its upper end, four clutch teeth-8 adapted to be receivedincorbarrel member 2 and to be attached thereto having their heads 11countersunk in the 5 working face of the bit between the usual one ofthese teeth ma be longer than the others as indicated in otted lines inFig. 1. As illustrated, the barrel member 2 is l kewise oi cruciformexternal shape throughout (see Fig. 3) v and preferably of exrespondingopenings 9 in the lower end of the diamonds thereon (not shown). Ifdesired" or expansible type usually permitting sufi 'cient fluid flowtherethrough. If desired,

enough jfluid passages 12 may also be provided in the conical liftersupporting surface on the member 2, adapted to register with thepassages 6 in the bit, so :that the total flow area of these assages andthe ordinary slots in the core 1i er will be substantially equal to'thearea of the passages 6 in the bit.

As a result of my improved construction it will be observed thatefiective wings adapted to slap the mud fluid into the walls of the holeare provided on the bit and barrel at the same time that provision ismade for the passage of a large amount of mud fluid to the 70 bottom ofthe hole bud for the upward passage of the same along the bit andbarrel, the construction being such as materially to lessen the dangerof the barrel sticking in a hole. It will further be noted that byreason 7e of the clutch type connection between the cruciform bit andbarrel, the desired registry of the external passages in the fiuted rcruciform bit and barrel may be obtained with facility while the partsmay be readily separated when desired and the core lifter may be removedfrom the upper end of the barrel Moreover, through the provision of alonger tooth, registry of non-symmetrlcal passages 12 with certainassages 6 may be assured. 5 While I have in this applicationspecifically described one form w "ch my invention may assume inpractice, it will be understood that this form of the same is shown forpurposes of illustration and that the invention may be modified andembodied in various other forms without departing from? its spirit orthe scope of the ap nded claims.

What I claim as new and desireto secure by Letters Patent is;

1. A core barrel comprising a win ed bit, a win ed core receiving barrelmem r detachab y connected thereto, and a core lifter their length andhaving internal passage means, the passage means in said barrel 1ncludin'passa e means formed in the internal w of said barrel member aroundsaid 5 core lifter.

2. A core barrel havmg a winged bit and a core receivin barrel member.of the s'ame general-winge shape, said elements being of the same shargesubstantially throughout m the length of the arrel and each having fluidpassages formed therein, and means for causing connection of said bitand barrel memher with the win s and fluid gassa es of one i in registrywith t e wings an flui passages 15 of the other, said means includingclutch teeth on adjacent elements.

3. A core barrel having a winged bit and a winged core receivin,barrelmember of the same general winge shape, said elements 0 being ofthe same shape substantiall throughout the length of the barrel and eachaving fluid passages formed therein, and means for ca connection ofsaid bit and barrel member with the win s and fluid passages of one inregistry wit the wings and fluid passages of the other, said meansincluding clutch teeth on adjacent elements and screws connectin thesame and countersunk in the working ace of the bit.

30 4. A core barrel comprising a core receiving barrel member having aninternally fluted bore and a core lifter carried in sa1d bore anddirectly engaging the walls of the latter, said internal utes formingfluid passages 35 externally of the core lifter.

5. A core barrel having an externally and internally fluted corereceiving portion, an externally and internally fluted bit carriedthereon and a core lifter carried directly as by the internally flutedportion of said barrel, the internal flutes in said core receivingportion'forming fluid passages externally of said core lifter.

6. A core barrel comprising an internally 5 and externally fluted corereceiving barrel member a bit carried'by said member having flutes ed:vwith the flutes in said barrel member, and a core lifter slidablycarried directly by said'barrel member the internal so flutes in saidbarrel member forming fluid passa eg rternally of said core lifter. 7.core barrel comprisin a core receiving barrel member having aninternally fluted conical bore and a tapered core lifter carried 6 inand bore and directly on the walls of the latter, said internaf ii te sforming fluid peassages externall of the core lifter.

In stlmony whereo Iaflix m ature.

JOSEPH 8. LL.

